1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
|
/* Dependency generator for Makefile fragments.
Copyright (C) 2000-2019 Free Software Foundation, Inc.
Contributed by Zack Weinberg, Mar 2000
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
#include "config.h"
#include "system.h"
#include "mkdeps.h"
/* Not set up to just include std::vector et al, here's a simple
implementation. */
/* Keep this structure local to this file, so clients don't find it
easy to start making assumptions. */
struct mkdeps
{
public:
/* T has trivial cctor & dtor. */
template <typename T>
class vec
{
private:
T *ary;
unsigned num;
unsigned alloc;
public:
vec ()
: ary (NULL), num (0), alloc (0)
{}
~vec ()
{
XDELETEVEC (ary);
}
public:
unsigned size () const
{
return num;
}
const T &operator[] (unsigned ix) const
{
return ary[ix];
}
T &operator[] (unsigned ix)
{
return ary[ix];
}
void push (const T &elt)
{
if (num == alloc)
{
alloc = alloc ? alloc * 2 : 16;
ary = XRESIZEVEC (T, ary, alloc);
}
ary[num++] = elt;
}
};
struct velt
{
const char *str;
size_t len;
};
mkdeps ()
: quote_lwm (0)
{
}
~mkdeps ()
{
unsigned int i;
for (i = targets.size (); i--;)
free (const_cast <char *> (targets[i]));
for (i = deps.size (); i--;)
free (const_cast <char *> (deps[i]));
for (i = vpath.size (); i--;)
XDELETEVEC (vpath[i].str);
}
public:
vec<const char *> targets;
vec<const char *> deps;
vec<velt> vpath;
public:
unsigned short quote_lwm;
};
/* Apply Make quoting to STR, TRAIL etc. Note that it's not possible
to quote all such characters - e.g. \n, %, *, ?, [, \ (in some
contexts), and ~ are not properly handled. It isn't possible to
get this right in any current version of Make. (??? Still true?
Old comment referred to 3.76.1.) */
static const char *
munge (const char *str, const char *trail = NULL, ...)
{
static unsigned alloc;
static char *buf;
unsigned dst = 0;
va_list args;
if (trail)
va_start (args, trail);
for (bool first = true; str; first = false)
{
unsigned slashes = 0;
char c;
for (const char *probe = str; (c = *probe++);)
{
if (alloc < dst + 4 + slashes)
{
alloc = alloc * 2 + 32;
buf = XRESIZEVEC (char, buf, alloc);
}
switch (c)
{
case '\\':
slashes++;
break;
case '$':
buf[dst++] = '$';
goto def;
case ' ':
case '\t':
/* GNU make uses a weird quoting scheme for white space.
A space or tab preceded by 2N+1 backslashes
represents N backslashes followed by space; a space
or tab preceded by 2N backslashes represents N
backslashes at the end of a file name; and
backslashes in other contexts should not be
doubled. */
while (slashes--)
buf[dst++] = '\\';
/* FALLTHROUGH */
case '#':
case ':':
buf[dst++] = '\\';
/* FALLTHROUGH */
default:
def:
slashes = 0;
break;
}
buf[dst++] = c;
}
if (first)
str = trail;
else
str = va_arg (args, const char *);
}
if (trail)
va_end (args);
buf[dst] = 0;
return buf;
}
/* If T begins with any of the partial pathnames listed in d->vpathv,
then advance T to point beyond that pathname. */
static const char *
apply_vpath (struct mkdeps *d, const char *t)
{
if (unsigned len = d->vpath.size ())
for (unsigned i = len; i--;)
{
if (!filename_ncmp (d->vpath[i].str, t, d->vpath[i].len))
{
const char *p = t + d->vpath[i].len;
if (!IS_DIR_SEPARATOR (*p))
goto not_this_one;
/* Do not simplify $(vpath)/../whatever. ??? Might not
be necessary. */
if (p[1] == '.' && p[2] == '.' && IS_DIR_SEPARATOR (p[3]))
goto not_this_one;
/* found a match */
t = t + d->vpath[i].len + 1;
break;
}
not_this_one:;
}
/* Remove leading ./ in any case. */
while (t[0] == '.' && IS_DIR_SEPARATOR (t[1]))
{
t += 2;
/* If we removed a leading ./, then also remove any /s after the
first. */
while (IS_DIR_SEPARATOR (t[0]))
++t;
}
return t;
}
/* Public routines. */
struct mkdeps *
deps_init (void)
{
return new mkdeps ();
}
void
deps_free (struct mkdeps *d)
{
delete d;
}
/* Adds a target T. We make a copy, so it need not be a permanent
string. QUOTE is true if the string should be quoted. */
void
deps_add_target (struct mkdeps *d, const char *t, int quote)
{
t = xstrdup (apply_vpath (d, t));
if (!quote)
{
/* Sometimes unquoted items are added after quoted ones.
Swap out the lowest quoted. */
if (d->quote_lwm != d->targets.size ())
{
const char *lowest = d->targets[d->quote_lwm];
d->targets[d->quote_lwm] = t;
t = lowest;
}
d->quote_lwm++;
}
d->targets.push (t);
}
/* Sets the default target if none has been given already. An empty
string as the default target in interpreted as stdin. The string
is quoted for MAKE. */
void
deps_add_default_target (struct mkdeps *d, const char *tgt)
{
/* Only if we have no targets. */
if (d->targets.size ())
return;
if (tgt[0] == '\0')
deps_add_target (d, "-", 1);
else
{
#ifndef TARGET_OBJECT_SUFFIX
# define TARGET_OBJECT_SUFFIX ".o"
#endif
const char *start = lbasename (tgt);
char *o = (char *) alloca (strlen (start)
+ strlen (TARGET_OBJECT_SUFFIX) + 1);
char *suffix;
strcpy (o, start);
suffix = strrchr (o, '.');
if (!suffix)
suffix = o + strlen (o);
strcpy (suffix, TARGET_OBJECT_SUFFIX);
deps_add_target (d, o, 1);
}
}
void
deps_add_dep (struct mkdeps *d, const char *t)
{
gcc_assert (*t);
t = apply_vpath (d, t);
d->deps.push (xstrdup (t));
}
void
deps_add_vpath (struct mkdeps *d, const char *vpath)
{
const char *elem, *p;
for (elem = vpath; *elem; elem = p)
{
for (p = elem; *p && *p != ':'; p++)
continue;
mkdeps::velt elt;
elt.len = p - elem;
char *str = XNEWVEC (char, elt.len + 1);
elt.str = str;
memcpy (str, elem, elt.len);
str[elt.len] = '\0';
if (*p == ':')
p++;
d->vpath.push (elt);
}
}
/* Write NAME, with a leading space to FP, a Makefile. Advance COL as
appropriate, wrap at COLMAX, returning new column number. Iff
QUOTE apply quoting. Append TRAIL. */
static unsigned
make_write_name (const char *name, FILE *fp, unsigned col, unsigned colmax,
bool quote = true, const char *trail = NULL)
{
if (quote)
name = munge (name, trail, NULL);
unsigned size = strlen (name);
if (col)
{
if (colmax && col + size> colmax)
{
fputs (" \\\n", fp);
col = 0;
}
col++;
fputs (" ", fp);
}
col += size;
fputs (name, fp);
return col;
}
/* Write all the names in VEC via make_write_name. */
static unsigned
make_write_vec (const mkdeps::vec<const char *> &vec, FILE *fp,
unsigned col, unsigned colmax, unsigned quote_lwm = 0,
const char *trail = NULL)
{
for (unsigned ix = 0; ix != vec.size (); ix++)
col = make_write_name (vec[ix], fp, col, colmax, ix >= quote_lwm, trail);
return col;
}
/* Write the dependencies to a Makefile. If PHONY is true, add
.PHONY targets for all the dependencies too. */
static void
make_write (const struct mkdeps *d, FILE *fp, bool phony, unsigned int colmax)
{
unsigned column = 0;
if (colmax && colmax < 34)
colmax = 34;
if (d->deps.size ())
{
column = make_write_vec (d->targets, fp, 0, colmax, d->quote_lwm);
fputs (":", fp);
column++;
column = make_write_vec (d->deps, fp, column, colmax);
fputs ("\n", fp);
if (phony)
for (unsigned i = 1; i < d->deps.size (); i++)
fprintf (fp, "%s:\n", munge (d->deps[i]));
}
}
/* Write out dependencies according to the selected format (which is
only Make at the moment). */
void
deps_write (const struct mkdeps *d, FILE *fp, bool phony, unsigned int colmax)
{
make_write (d, fp, phony, colmax);
}
/* Write out a deps buffer to a file, in a form that can be read back
with deps_restore. Returns nonzero on error, in which case the
error number will be in errno. */
int
deps_save (struct mkdeps *deps, FILE *f)
{
unsigned int i;
size_t size;
/* The cppreader structure contains makefile dependences. Write out this
structure. */
/* The number of dependences. */
size = deps->deps.size ();
if (fwrite (&size, sizeof (size), 1, f) != 1)
return -1;
/* The length of each dependence followed by the string. */
for (i = 0; i < deps->deps.size (); i++)
{
size = strlen (deps->deps[i]);
if (fwrite (&size, sizeof (size), 1, f) != 1)
return -1;
if (fwrite (deps->deps[i], size, 1, f) != 1)
return -1;
}
return 0;
}
/* Read back dependency information written with deps_save into
the deps sizefer. The third argument may be NULL, in which case
the dependency information is just skipped, or it may be a filename,
in which case that filename is skipped. */
int
deps_restore (struct mkdeps *deps, FILE *fd, const char *self)
{
size_t size;
char *buf = NULL;
size_t buf_size = 0;
/* Number of dependences. */
if (fread (&size, sizeof (size), 1, fd) != 1)
return -1;
/* The length of each dependence string, followed by the string. */
for (unsigned i = size; i--;)
{
/* Read in # bytes in string. */
if (fread (&size, sizeof (size), 1, fd) != 1)
return -1;
if (size >= buf_size)
{
buf_size = size + 512;
buf = XRESIZEVEC (char, buf, buf_size);
}
if (fread (buf, 1, size, fd) != size)
{
XDELETEVEC (buf);
return -1;
}
buf[size] = 0;
/* Generate makefile dependencies from .pch if -nopch-deps. */
if (self != NULL && filename_cmp (buf, self) != 0)
deps_add_dep (deps, buf);
}
XDELETEVEC (buf);
return 0;
}
|